The hearing loss that can occur from noise exposure is permanent because:
1. Nerve endings do not regenerate.
2. The bones in the middle ear have become hardened.
3. The tympanic membrane is ruptured.
4. There is chronic inflammation of the middle ear.
Nerve endings do not regenerate.
Rationale: The hearing loss that results from noise exposure is sensorineural. Noise exposure over time will damage or destroy the nerve endings in the inner ear. The hearing loss is permanent because the nerve endings will not regenerate. It does not cause the bones of the middle ear to harden. A very loud noise could possibly cause the tympanic membrane to rupture, but this would not cause a permanent hearing loss. Chronic inflammation is not caused by noise exposure.
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